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Deficiency's?

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My brother has 4 plants in 3 gallon pots all are in promix hp amended with gaia green power bloom. He waters when the plants are dry . There's lots of wind and sun. He doesn't ph but hasn't the entire time and our city water is right around 7. Two of the plants look ok and 2 look terrible. Any ideas?
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Can you get a close-up on the 4th picture I can't tell if it's calcium or potassium deficiency but it's likely caused by the high pH locking something out? Are these all the same strain?
 
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My guess would be the other two are more susceptible to the high ph and are showing the issue, promix likes 6.2

Can you get a close-up of those brown spots on the leaves
 
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Best pics I can get right now. I'll adjust the ph and see what happens the next week or so. Thanks for the help
 
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Best pics I can get right now. I'll adjust the ph and see what happens the next week or so. Thanks for the help
Couldn't tell from pic if it was a calcium issue or possibly something fungi, looks more like a calcium issue from what I can see, it may well straighten out when you correct the pH
 

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